At the equator you'd be travelling east at just over 1000 mph due to the rotation of the earth.

London is 51 degrees latitude and it's not so far round the globe this far north, so you'll only be doing 800 mph or so. Either way, hold on to your hat.

If you find these speeds a bit scary go and sit a yard from the North Pole - there you'll only be doing about 9 inches an hour. And try not to think about the 66,000 mph at which you're zooming around the sun!